Negative-ion/molecule reactions in sulphur hexafluoride

Using a double Townsend (uniform field) ionization chamber, the authors studied the ion conversion reactions involving SF 6 - and SF 5 - in SF 6 by observing, with mass spectrometer sampling, the processes occurring when these ions were injected separately from the source region into that where collisional detachment and/or ion conversion took place. E/N (the ratio of electric field strength to gas number density) varied from about 20-500 Td and pressures from about 1-50 Torr.